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ABCDE altitude approaches axis base bisects called centre chord circle circular cone circumference circumscribed coincide common cone construct convex corresponding cube curve denote described diameter difference dihedral angles directrix distance divided draw drawn edges element ellipse equal equivalent face angles faces feet Find Find the volume foci focus formed frustum given plane given point greater Hence hyperbola inches included inscribed intersection lateral area lateral edges less limit measure meet opposite parabola parallel parallelopiped perpendicular plane plane MN plane passing pole polygon polyhedron prism Proof PROPOSITION prove pyramid radii radius ratio regular pyramid respectively right circular segment sides similar slant height solid sphere spherical triangle square straight line surface symmetrical tangent tetrahedron THEOREM third triangular trihedral unequal vertex vertices volume Wentworth's zone
Page 274 - If two planes are perpendicular to each other, a straight line drawn in one of them, perpendicular to their intersection, is perpendicular to the other.
Page 383 - Hence the two last are right angles ; hence the arc drawn from the vertex of an isosceles spherical triangle to the middle of the base, is at right angles to the base, and bisects the vertical angle.
Page 250 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. To prove that Proof. A Let the triangles ABC and ADE have the common angle A. A ABC -AB X AC Now and A ADE AD X AE Draw BE.
Page 285 - The sum of the face angles of any convex polyhedral angle is less than four right angles.
Page 246 - PERIPHERY of a circle is its entire bounding line ; or it is a curved line, all points of which are equally distant from a point within called the centre.
Page 245 - The straight line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of it 46 INTERCEPTS BY PARALLEL LINES.
Page 254 - If a straight line is perpendicular to each of two other straight lines at their point of intersection, it is perpendicular to the plane of the two lines.
Page 295 - An oblique prism is equivalent to a right prism whose base is equal to a right section of the oblique prism, and whose altitude is equal to a lateral edge of the oblique prism. r Let FI be a right section of the oblique prism AD', and PI" a right prism whose lateral edges are equal to the lateral edges of AD'.